Housing

ABSTRACT

A housing that houses a fuel cell system including: a hydrogen storage unit; a fuel cell stack that generates electric power using hydrogen supplied from the hydrogen storage unit; a pipe that connects the hydrogen storage unit and the fuel cell stack; and a power storage unit, the housing includes: an upper surface portion; a plurality of side surface portions; a ventilation hole, provided with the upper surface portion, configured to ventilate an inside and an outside of the housing; a ventilation hole, provided with a side surface portion of the plurality of side surface portions, configured to ventilate the inside and the outside of the housing; and an air supply device configured to discharge air taken in through one ventilation hole of the ventilation hole of the upper face portion and the ventilation hole of the side face portion from the other ventilation hole.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims the benefit of priority of JapanesePatent Application No. 2020-185440, filed on Nov. 5, 2020, the contentof which is incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to a housing that houses a fuel cellsystem including a hydrogen storage unit, a fuel cell stack thatgenerates electric power using hydrogen supplied from the hydrogenstorage unit, and a power storage unit that can store electric powergenerated by the fuel cell stack.

BACKGROUND ART

In recent years, attention has been paid to fuel cell systems that havehigh energy efficiency and are environmentally friendly. A fuel cellsystem includes a hydrogen storage unit that stores hydrogen, a fuelcell stack that generates electric power using hydrogen supplied fromthe hydrogen storage unit, and a power storage unit that stores electricpower obtained by electric power generation performed by the fuel cellstack.

There is a technique in which such a fuel cell system is mounted on avehicle, and electric power of the fuel cell system can be supplied to adrive motor of the vehicle or to an external electronic device or thelike (for example, see JP-A-2002-141078). There is also a technique inwhich such a fuel cell system is mounted on a trailer or the like towedby a vehicle so as to be used as a movable power supply (for example,see JP-T-2006-523373 and JP-A-2003-317787).

In order to improve convenience as a mobile power source, it isconceivable that the hydrogen storage unit, the fuel cell stack, and thepower storage unit are housed in the same housing in the fuel cellsystem. However, when these components are housed in the same housing,when hydrogen leaks from the hydrogen storage unit, the fuel cell stack,or the piping connecting the hydrogen storage unit and the fuel cellstack, there is a possibility that the leaked hydrogen flows into thepower storage unit and becomes a cause of a fire, and there is room forimprovement in this respect from the viewpoint of improvement of thesafety of the fuel cell system.

SUMMARY

An object of the present invention is to provide a housing in which evenwhen hydrogen leaks in a housing of a fuel cell system, the leakedhydrogen is suppressed from flowing into a power storage unit disposedin the housing, and safety of the fuel cell system can be improved.

According to an aspect of the present invention, there is provided ahousing that houses a fuel cell system, the fuel cell system including:a hydrogen storage unit configured to store hydrogen; a fuel cell stackthat generates electric power using hydrogen supplied from the hydrogenstorage unit; a pipe that connects the hydrogen storage unit and thefuel cell stack; and a power storage unit that stores electric powerobtained by electric power generation performed by the fuel cell stackor supply from the outside, the housing including: an upper surfaceportion; a plurality of side surface portions; a ventilation hole,provided with the upper surface portion, configured to ventilate aninside and an outside of the housing; a ventilation hole, provided witha side surface portion of the plurality of side surface portions,configured to ventilate the inside and the outside of the housing; andan air supply device configured to discharge air taken in through oneventilation hole of the ventilation hole of the upper face portion andthe ventilation hole of the side face portion from the other ventilationhole.

According to the present invention, it is possible to provide a housingin which even when hydrogen leaks in the housing of the fuel cellsystem, the leaked hydrogen is suppressed from flowing into the powerstorage unit disposed in the housing, and the safety of the fuel cellsystem can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a fuel cell system and a housingaccording to an embodiment.

FIG. 2 is a perspective view of the fuel cell system and the housing ofFIG. 1 as viewed through contents thereof from an upper side.

FIG. 3 is a perspective view of the fuel cell system and the housing ofFIG. 1 as viewed through the contents thereof from a front side.

FIG. 4 is a perspective view of the fuel cell system and the housing ofFIG. 1 as viewed through the contents thereof from a left side.

FIG. 5 is a perspective view of the fuel cell system and the housing ofFIG. 1 as viewed through the contents thereof from a right side.

FIG. 6 is a front view of an input/output unit.

FIG. 7 is a schematic diagram illustrating a state where an electronicdevice and a vehicle are charged from a fuel cell system.

FIG. 8 is a schematic diagram of a moving body in which a vehicleserving as a towing portion, and a trailer serving as a towed portionare connected.

FIG. 9A is a schematic diagram of a moving body of another example, andis a top perspective view of the moving body.

FIG. 9B is a schematic diagram of a moving body of another example, andis a side view of the moving body.

FIG. 10A is an enlarged view of a connection portion in the moving bodyof FIG. 9 .

FIG. 10B is a rear view of a trailer in the moving body of FIG. 9 .

FIG. 10C is a front view of the trailer in a state where theattachment/detachment portion in the moving body of FIG. 9 is exposed.

FIG. 10D is a front view of the trailer in a state where a cover memberin the moving body of FIG. 9 is attached.

FIG. 11 is a block diagram illustrating an example of a functionalconfiguration of a moving body according to the present embodiment.

FIG. 12 is a flowchart illustrating an example of a control method ofthe fuel cell system according to the present embodiment.

FIG. 13 is a timing chart illustrating a specific example of electricpower supply by the fuel cell system of the present embodiment.

DESCRIPTION OF EMBODIMENTS

Hereinafter, an embodiment of the present invention will be describedwith reference to the accompanying drawings. In the presentspecification and the like, in order to simplify and clarify thedescription, a front-rear direction, a left-right direction, and anupper-lower direction are described in accordance with directions viewedfrom a user of a fuel cell system of the present embodiment. In thedrawings, a front side of a housing accommodating the fuel cell systemis denoted by Fr, a rear side thereof is denoted by Rr, a left sidethereof is denoted by L, a right side thereof is denoted by R, an upperside thereof is denoted by U. and a lower side thereof is denoted by D.

As illustrated in FIG. 1 , a fuel cell system 1 of the presentembodiment is a device capable of generating electric power usinghydrogen as a power generation energy source, and includes a housing 10.The housing 10 defines an outer shape of the fuel cell system 1, andhouses various components and units (for example, a fuel cell stack 40to be described later) provided in the fuel cell system 1.

The housing 10 includes: a box-shaped main body 11 that is made of resinor the like and provided with opening portions (not shown) on a leftside surface portion and a right side surface portion; a lid portion 12that covers the opening portions of the left side surface portion andthe right side surface portion of the main body 11; and casters 13 thatare provided on a lower surface portion of the main body 11. In a frontsurface portion (front side surface portion) and an upper surfaceportion of the main body 11, ventilation holes 14 and 16 that have asubstantially rectangular shape extending in the left-right directionand allow air to flow inside and outside the housing 10 are formed.

For example, one of the ventilation holes 14 and 16 (for example, theventilation hole 14) functions to take air outside the housing 10 to theinside of the housing 10, and the other ventilation hole (for example,the ventilation hole 16) functions to discharge air inside the housing10 to the outside of the housing 10. With the ventilation holes 14 and16, air permeability between the inside and the outside of the housing10 can be secured, high-temperature air can be prevented from staying inthe housing 10, and cooling of the fuel cell system 1 is achieved. Inaddition, since air permeability between the inside and the outside ofthe housing 10 is secured with the ventilation holes 14 and 16, evenwhen hydrogen is generated inside the housing 10 due to some factor, thehydrogen can be quickly discharged to the outside of the housing 10.

The ventilation hole 14 is provided in the front surface portion of themain body 11, at a position corresponding to a side 18 connecting thefront surface portion and the upper surface portion of the main body 11(that is, the housing 10) so as to extend along the side 18. Further,the ventilation hole 16 is provided in the upper surface portion of themain body 11, at a position corresponding to the side 18 so as to extendalong the side 18. In other words, the side 18 is interposed between theventilation hole 14 and the ventilation hole 16. Accordingly, ascompared with the case where the ventilation hole 14 and the ventilationhole 16 are provided directly adjacent to each other, it is possible tosecure the air permeability between inside and outside of the housing 10while maintaining the strength of the main body 11 (that is, the housing10).

In addition, a plurality of louvers 15 and 17 parallel to each other areprovided in the ventilation holes 14 and 16 along the longitudinaldirection (that is, the left-right direction) of the ventilation holes14 and 16. The louvers 15 and 17 can be configured such that, forexample, air or the like discharged from the ventilation hole on anexhaust side (for example, the ventilation hole 16) among theventilation holes 14 and 16 is less likely to flow into the ventilationhole on an intake side (for example, the ventilation hole 14). With thisconfiguration, it is possible to prevent the high-temperature airdischarged to the outside of the housing 10 from being taken to theinside of the housing 10 again. In addition, with this configuration, itis possible to prevent hydrogen discharged to the outside of the housing10 from being taken to the inside of the housing 10 again.

In addition, an input/output unit 19 used to output electric power ofthe fuel cell system 1 to the outside or input electric power from theoutside to the fuel cell system 1 is provided below the ventilation hole14 in the front surface portion of the main body 11. By providing theinput/output unit 19 in the front surface portion of the main body 11similarly to the ventilation hole 14, it is possible to secure bothaccessibility of the user to the input/output unit 19 and the airpermeability of the ventilation hole 14.

That is, from the viewpoint of securing the air permeability of the venthole 14, the fuel cell system 1 can be used in a state where apredetermined space is secured on the front surface side of the housing10 (main body 11). Therefore, by providing the input/output unit 19 inthe front surface portion of the main body 11 similarly to theventilation hole 14, the user can easily access the input/output unit 19through the space at the time of using the fuel cell system 1, and thefuel cell system 1 can be smoothly connected to an external device orthe like. An example of the input/output unit 19 will be described laterwith reference to FIG. 6 .

As illustrated in FIGS. 2 to 5 , the fuel cell system 1 is configured byhousing, in the housing 10, a hydrogen storage unit 30 that has ahydrogen supply/discharge hole 31, the fuel cell stack 40 that generateselectric power using hydrogen supplied from the hydrogen storage unit30, a pipe (not shown) that connects the hydrogen storage unit 30 andthe fuel cell stack 40, and an power storage unit 50 that storeselectric power generated by the fuel cell stack 40 or supplied from theoutside.

The hydrogen storage unit 30 is a tank or the like capable of storinghydrogen (for example, liquid hydrogen) supplied from the outsidethrough the supply/discharge hole 31. The supply/discharge hole 31 isprovided so as to protrude leftward from a center of a left side surfaceportion of the hydrogen storage unit 30, and faces the lid portion 12that covers the opening portion of the left side surface portion of themain body 11, in the left-right direction. Therefore, the user canaccess the supply/discharge hole 31 by removing the lid portion 12covering the opening portion of the left side surface portion of themain body 11 from the main body 11, and can easily fill the hydrogenstorage unit 30 with hydrogen. The hydrogen stored in the hydrogenstorage unit 30 is supplied to the fuel cell stack 40 via thesupply/discharge hole 31 and the above-described pipe having one endconnected to the supply/discharge hole 31 and the other end connected tothe fuel cell stack 40.

The hydrogen storage unit 30 is disposed at a position overlapping theventilation hole 16 in a top view of the housing 10, and is disposed ata position overlapping the ventilation hole 14 in a front view (that is,a side view from the front side) of the housing 10. Since the hydrogenstorage unit 30 is disposed in this manner, for example, at the time offilling the hydrogen storage unit 30 with hydrogen, hydrogen released tothe surroundings of the hydrogen storage unit 30 (hereinafter, alsoreferred to as released hydrogen) can be quickly discharged from theventilation holes 14 and 16 to the outside of the housing 10. Therefore,it is possible to suppress the released hydrogen from staying in thehousing 10 and flowing toward the power storage unit 50, and it ispossible to improve the safety of the fuel cell system 1.

In addition, since a configuration in which the released hydrogen isquickly discharged to the outside of the housing 10 is adopted, when ahydrogen detector (not shown) is provided in the housing 10, thehydrogen detector can detect hydrogen leaking from the hydrogen storageunit 30, the fuel cell stack 40, or a pipe connecting the hydrogenstorage unit 30 and the fuel cell stack 40 (hereinafter, also referredto as leaked hydrogen) distinguishingly from the released hydrogen. Thatis, it is considered that the released hydrogen is quickly discharged tothe outside of the housing 10 from the ventilation hole 16 or the likewithout being detected by the hydrogen detector. On the other hand, itis considered that leaked hydrogen from the fuel cell stack 40 or thepipe connecting the hydrogen storage unit 30 and the fuel cell stack 40is detected by the hydrogen detector since the leaked hydrogen stays atleast temporarily in the housing 10. Therefore, by adopting aconfiguration in which released hydrogen is quickly discharged to theoutside of the housing 10, when a hydrogen detector is provided in thehousing 10, the hydrogen detector can detect leaked hydrogendistinguishingly from the released hydrogen (in other words, only theleaked hydrogen can be detected).

The fuel cell stack 40 generates electric power by causing a chemicalreaction between hydrogen supplied from the hydrogen storage unit 30 andoxygen in the air. The electric power generated by the fuel cell stack40 is output from an output terminal (not shown) provided in the fuelcell stack 40, and is supplied to the power storage unit 50 via a wiring(not shown) or the like. The electric power generated by the fuel cellstack 40 may be output to the outside of the fuel cell system 1 via theinput/output unit 19.

The fuel cell stack 40 is disposed behind the hydrogen storage unit 30in the housing 10. In addition, a connection portion of the fuel cellstack 40 with the pipe is provided on one side surface side (the leftside surface side in the present embodiment) in a top view of thehousing 10. Accordingly, to be schematically illustrated, the pipeconnecting the hydrogen storage unit 30 (the supply/discharge hole 31)and the fuel cell stack 40, that is, a hydrogen passing route from thehydrogen storage unit 30 to the fuel cell stack 40 is directed from thefront side to the rear side, as indicated by an arrow X1 in FIG. 2 , ata position close to the left side in the housing 10.

In addition, the output terminal provided in the fuel cell stack 40 isprovided on the other side surface side (the right side surface side inthe present embodiment) in a top view of the housing 10. Therefore, tobe schematically illustrated, a conversion route from hydrogen toelectric power by the fuel cell stack 40 is directed from the left sideto the right side, as indicated by an arrow X2 in FIG. 2 , at a positionclose to the rear side in the housing 10. Here, the conversion routefrom hydrogen to electric power by the fuel cell stack 40 is, forexample, a line segment connecting the connection portion of the fuelcell stack 40 with the pipe and the output terminal of the fuel cellstack 40.

The power storage unit 50 stores the electric power supplied from thefuel cell stack 40. The power storage unit 50 is implemented by, forexample, any type of secondary battery such as a lithium ion battery, anickel hydrogen battery, or a lead storage battery. The electric powerstored in the power storage unit 50 can be output to the outside of thefuel cell system 1 via the input/output unit 19.

As illustrated in FIGS. 3 to 5 , the power storage unit 50 is disposedon the lower surface portion (bottom surface) of the housing 10. In thehousing 10, an upper surface portion of the power storage unit 50 islocated at a position lower than the hydrogen storage unit 30 (thesupply/discharge hole 31), the fuel cell stack 40, and the pipeconnecting the hydrogen storage unit 30 and the fuel cell stack 40. Inother words, in the housing 10, the hydrogen storage unit 30 (thesupply/discharge hole 31), the fuel cell stack 40, and the pipeconnecting the hydrogen storage unit 30 and the fuel cell stack 40 areprovided at positions higher than the upper surface portion of the powerstorage unit 50.

As described, by providing the components, such as the supply/dischargehole 31, the fuel cell stack 40, and the pipe connecting thesupply/discharge hole 31 and the fuel cell stack 40, from which hydrogenmay leak, at positions higher than the upper surface portion of thepower storage unit 50, even when hydrogen leaks from these components,it is possible to suppress the hydrogen from flowing toward the powerstorage unit 50. That is, hydrogen having a lower specific gravity thanair goes upward (that is, in a direction opposite to the power storageunit 50) even when the hydrogen leaks from the above-describedcomponents. Therefore, by disposing the components from which hydrogenmay leak above the power storage unit 50, even when hydrogen leaks fromthese components, the leaked hydrogen can be suppressed from flowingtoward the power storage unit 50, and the safety of the fuel cell system1 can be improved.

In addition, a control unit 60 is further provided in the housing 10.The control unit 60 includes, for example, a power conversion unit (notillustrated) including a DC/DC converter, an inverter, and the like, anda control device (not illustrated) including a microcomputer or the likethat controls the power conversion unit. The control unit 60 iselectrically connected to, for example, the power storage unit 50 andthe input/output unit 19, converts electric power output from the powerstorage unit 50 into predetermined electric power (for example, analternating current of 100V and 50 Hz), and supplies the convertedelectric power to the input/output unit 19. Accordingly, the fuel cellsystem 1 can output electric power that is convenient for the user fromthe input/output unit 19.

The control unit 60 may convert a plurality of types of electric powerso as to be able to output a plurality of types of electric power suchas high-voltage electric power and low-voltage electric power from theinput/output unit 19. Accordingly, for example, low-voltage electricpower can be output from electric-power supply holes 81 and 82, whichwill be described later, in the input/output unit 19, and high-voltageelectric power can be output from an electric-power supply hole 83,which will be described later, in the input/output unit 19.

The control unit 60 is disposed in the housing 10, on the right side ofthe hydrogen storage unit 30 and on the front side of the fuel cellstack 40. The input/output unit 19 is also provided close to the rightside of the housing 10 so as to correspond to the control unit 60.Further, terminals, wiring, and the like for electrically connecting thecontrol unit 60, the power storage unit 50, and the input/output unit 19are also provided close to the right side of the housing 10 so as tocorrespond to the control unit 60. Therefore, to be schematicallyillustrated, an electric-power passing route in the housing 10 isdirected from the rear side to the front side at a position close to theright side in the housing 10, as indicated by an arrow X3 in FIG. 2 .

That is, the components of the fuel cell system 1 are disposed in thehousing 10 such that the hydrogen passing route X1, the conversion routeX2 from hydrogen to electric power, and the electric-power passing routeX3 substantially form a U-shape in a top view of the housing 10.Accordingly, a component handling hydrogen (that is, a component fromwhich hydrogen may leak) and a component handling electricity can bedisposed apart from each other in the housing 10, and even when hydrogenleaks from the component handling hydrogen, the leaked hydrogen can beprevented from flowing toward the component handling electricity.

That is, in the present embodiment, components handling hydrogen, suchas the supply/discharge hole 31, the pipe connecting the hydrogenstorage unit 30 and the fuel cell stack 40, and the connection portionof the fuel cell stack 40 with the pipe, are provided in a hydrogenutilization area A1 (see FIG. 2 ) on the left side in a top view of thehousing 10. On the other hand, components handling electricity, such asthe input/output unit 19, the control unit 60, and terminals and wiringfor electrically connecting the control unit 60, the power storage unit50, and the input/output unit 19, are provided in an electricityutilization area A2 (see FIG. 2 ) on the right side in a top view of thehousing 10. In this way, by dividing the areas (regions) in which thecomponents handling hydrogen and the components handling electricity aredisposed, the components handling hydrogen and the components handlingelectricity can be disposed separately in the housing 10, and even whenhydrogen leaks from the components handling hydrogen, the leakedhydrogen can be suppressed from flowing toward the components handlingelectricity, and the safety of the fuel cell system 1 can be improved.

In the housing 10, air supply devices 21 and 22 are provided atpositions facing the ventilation hole 16 (ventilation hole provided inthe upper surface portion of the main body 11) described above in anupper-lower direction. Each of the air supply devices 21 and 22 is, forexample, an electric fan having an impeller that is driven to rotate inaccordance with the supply of electric power. With rotation of theimpeller, the air supply devices 21 and 22 blow air in the housing 10 tothe outside of the housing 10 through the ventilation hole 16. With theair supply devices 21 and 22, the housing 10 can be prompted to take inair from the ventilation hole 14 into the housing 10 to discharge theair in the housing 10 from the ventilation hole 16, and the airpermeability between inside and outside of the housing 10 can beimproved.

In addition, according to the air supply devices 21 and 22, since theair permeability between inside and outside of the housing 10 can beimproved, it is possible to quickly discharge, to the outside of thehousing 10, the released hydrogen generated at the time of fillinghydrogen into the hydrogen storage unit 30, the hydrogen leaked from thehydrogen storage unit 30, the above-described pipe, or the like, and itis possible to suppress the hydrogen from staying in the housing 10 andflowing into the power storage unit 50. Accordingly, the safety of thefuel cell system 1 can be improved. That is, since the specific gravityof the hydrogen leaked into the housing 10 is smaller than that of theair, the hydrogen rises in the housing 10. Therefore, by providing theair supply devices 21 and 22 so as to face the ventilation hole 16 inthe upper surface portion of the main body 11, it is possible to quicklydischarge the hydrogen rising in the housing 10 to the outside of thehousing 10 through the ventilation hole 16.

As illustrated in FIG. 3 , the air supply device 21 is provided at aposition facing the supply/discharge hole 31 in the upper-lowerdirection. In other words, the air supply device 21 is provided at aposition overlapping the supply/discharge hole 31 in a top view of thehousing 10. Accordingly, the air supply device 21 can quickly dischargehydrogen, which leaks from the supply/discharge hole 31 and risesupward, to the outside of the housing 10, and can improve the safety ofthe fuel cell system 1.

As illustrated in FIG. 6 , the input/output unit 19 includes a pluralityof electric-power supply holes such as electric-power supply holes 81,82, and 83. In the input/output unit 19, the electric-power supply holes81 and 82 and electric-power supply holes having the same shape as theelectric-power supply holes 81 and 82 are electric-power supply holes(hereinafter, also referred to as low-voltage power supply holes) usedfor inputting and outputting low-voltage electric power of, for example,about 100V. The plurality of low-voltage electric-power supply holesprovided in the input/output unit 19 are alternately disposed in theupper-lower direction and a horizontal direction. Accordingly, forexample, even when a large-sized adapter such as an AC adapter isinserted into one low-voltage electric-power supply hole, it is possibleto prevent the one low-voltage electric-power supply hole frominterfering with adjacent low-voltage electric-power supply hole.Therefore, a plurality of devices can be connected to the fuel cellsystem 1 at the same time, and convenience provided by the fuel cellsystem 1 can be improved. The low-voltage electric-power supply holessuch as the electric-power supply holes 81 and 82 are used, for example,when connecting the fuel cell system 1 and an electronic device 150 tobe described later.

In the input/output unit 19, the electric-power supply hole 83 is anelectric-power supply hole (hereinafter, also referred to as ahigh-voltage electric-power supply hole) used for inputting andoutputting high-voltage electric power of, for example, 200V. Theelectric-power supply hole 83 (that is, the high-voltage electric-powersupply hole) is used, for example, when connecting the fuel cell system1 and a vehicle 100 to be described later.

(Example of Utilization of Fuel Cell System)

Next, an example of utilization of the fuel cell system 1 will bedescribed. The fuel cell system 1 can supply electric power to anexternal device connected to the input/output unit 19. As illustrated inFIG. 7 , the fuel cell system 1 can be connected to, for example, thevehicle 1M. Here, the vehicle 100 is, for example, a hybrid electricvehicle or an electric vehicle. That is, the vehicle 100 includes adrive device (for example, see reference sign 110 in FIG. 11 ) thatperforms driving in response to electric power supply, and a battery(for example, see reference sign 120 in FIG. 11 ) that can supplyelectric power to the drive device. The vehicle 100 travels by drivingof the drive device.

When the fuel cell system 1 is connected to the vehicle 100, the fuelcell system 1 supplies, to the vehicle 100, electric power for drivingthe drive device of the vehicle 100 and electric power for charging thebattery of the vehicle 100. In addition, the fuel cell system 1 can beconnected to the electronic device 150 of a user. Here, the electronicdevice 150 is, for example, an electronic device including a battery,such as a smartphone. When the fuel cell system 1 is connected to theelectronic device 150, the fuel cell system 1 supplies electric powerfor charging the battery of the electronic device 150 to the electronicdevice 150. According to such a fuel cell system 1, for example, it isalso useful for securing power supply in an emergency such as when adisaster occurs.

In addition, as illustrated in FIG. 8 , the fuel cell system 1 can bemounted on a moving body 300 and be used. Here, the moving body 300includes the vehicle 100 and a trailer 200 towed by the vehicle 100. Thevehicle 100 is an example of a towing portion in the present invention,and the trailer 200 is an example of a non-towing portion in the presentinvention.

The fuel cell system 1 (housing 10) mounted on the trailer 200 iselectrically connected to the vehicle 100, and supplies, to the vehicle100, electric power for driving the drive device of the vehicle 100 andelectric power for charging the battery of the vehicle 100. Accordingly,the fuel cell system 1 can function as a range extender of the vehicle100.

As illustrated in FIG. 8 , in a state where the fuel cell system 1 ismounted on the trailer 200, the fuel cell system 1 (the housing 10) isdisposed such that a side surface portion (that is, a front surfaceportion) provided with the input/output unit 19 faces the vehicle 100side. Accordingly, not only mechanical connection between the vehicle100 and the trailer 200 (connection for towing the trailer 200 by thevehicle 100) but also a wiring distance between the vehicle 100 and thefuel cell system 1 can be shortened, and electrical connection betweenthe vehicle 100 and the fuel cell system 1 can be easily performed.Further, in this way, it is possible to efficiently cool the fuel cellsystem 1 by effectively using air during movement (traveling) of themoving body 300.

In addition, in a state where the fuel cell system 1 is mounted on thetrailer 200, the fuel cell system 1 (the housing 10) is disposed at aposition on the vehicle 100 side relative to a rear end portion of awheel provided in the trailer 200 (see a virtual line L1). Accordingly,since the housing 10 is disposed on a front side relative to the rearend portion of the wheel of the trailer 200, when a rear-end collisionwith the trailer 200 is caused by a vehicle or the like traveling behindthe vehicle 100, the housing 10 can be protected by the wheel (forexample, a tire) of the trailer 200, and damage to the housing 10 can besuppressed.

A center of gravity G of the fuel cell system 1 (the housing 10) isdisposed on the vehicle 100 side relative to an axle of the trailer 200(see a virtual line L2). Accordingly, since the center of gravity G isdisposed close to a center of the moving body 300 in the front-reardirection, the stability of the moving body 300 during movement can beimproved.

FIGS. 9A, 9B, and 10A to 10D illustrate the moving body 300 of anotherexample, specifically, FIG. 9A is a top perspective view of the movingbody, and FIG. 9B is a side view of the moving body. In addition, FIG.10A is an enlarged view of a connection portion 310, FIG. 10B is a rearview of the trailer 200. FIG. 10C is a front view of the trailer 200 ina state where an attachment/detachment portion 210 is exposed, and FIG.10D is a front view of the trailer 200 in a state where a cover member220 is attached.

In the example illustrated in FIGS. 9A, 9B, and 10A to 10D, the trailer200 includes a stay space S where a person can stay, in addition to aspace (hereinafter, also referred to as a mounting space) for mountingthe fuel cell system 1 (housing 10). In the trailer 200, the mountingspace and the stay space S are defined and formed by using a panel orthe like so as to be independent spaces. That is, the housing 10 (thefuel cell system 1) is disposed outside the stay space S in the trailer200. Accordingly, livability of the stay space S can be improved.

In addition, in the example illustrated in FIGS. 9A, 9B, and 10A to 10D,the connection portion 310 (see FIG. 10A) and the attachment/detachmentportion 210 (see FIG. 10C) are provided on a front surface portion ofthe trailer 200. Here, the front surface portion of the trailer 200 is aside surface portion of the trailer 200 that faces the vehicle 100 whenthe trailer 200 is towed by the vehicle 100.

The trailer 200 is mechanically connected to the vehicle 100 via theconnection portion 310 so as to be towed by the vehicle 100. Aconnection cable 320 (see FIG. 11 ) that electrically connects the fuelcell system 1 mounted on the trailer 200 and the vehicle 100 is providedso as to extend from the trailer 200 toward the vehicle 100 along theconnection portion 310. The connection cable 320 includes anelectric-power supply line for supplying electric power of the fuel cellsystem 1 to the vehicle 100, a signal line for communicating between thefuel cell system 1 (for example, a control unit 90 to be describedlater) and the vehicle 100, and the like.

The attachment/detachment portion 210 defines and forms a mountingspace, and is configured such that the housing 10 can be attached fromthe outside. For example, the attachment/detachment portion 210 isimplemented with a panel or the like having a predetermined shape, anddefines a mounting space recessed in a substantially rectangularparallelepiped shape from the front surface portion of the trailer 200toward a rear side of the trailer 200. The housing 10 can be insertedinto the mounting space defined and formed by the attachment/detachmentportion 210 from a front side of the trailer 200 (that is, from theoutside). By inserting the housing 10 into the mounting space, thehousing 10 can be attached to the trailer 200. Therefore, the user caneasily mount the housing 10 on the trailer 200 (that is, the moving body300).

In addition, the attachment/detachment portion 210 (mounting space) canbe covered with the cover member 220 (see FIG. 10D) from the front sideof the trailer 200 (that is, from the vehicle 100 side) in a state wherethe housing 10 is attached. Accordingly, the housing 10 can be reliablyattached to the attachment/detachment portion 210, and the housing 10can be protected from foreign matters such as mud splashes and flyingstones from the front side caused by the movement of the moving body300.

In addition, in the example illustrated in FIGS. 9A, 9B, and 10A to 10D,a first electric-power supply unit 230 capable of supplying electricpower to the outside is provided in a side surface portion (for example,a left side surface portion) of the trailer 200. The input/output unit19 is configured to be electrically connected to the firstelectric-power supply unit 230 in a state where the housing 10 (the fuelcell system 1) is mounted on the trailer 200, so as to be able to supplyelectric power stored in the power storage unit 50 or electric powergenerated by the fuel cell stack 40 to the outside via the firstelectric-power supply unit 230. Accordingly, even when the housing 10(the fuel cell system 1) is mounted on the trailer 200, the electricpower of the fuel cell system 1 can be easily supplied to the outsidevia the first electric-power supply unit 230, and convenience of thefuel cell system 1 can be improved.

A second electric-power supply unit (not shown) that supplies electricpower to the stay space S is also provided inside the trailer 200. Theinput/output unit 19 is configured to be electrically connected to thesecond electric-power supply unit in a state where the housing 10 (thefuel cell system 1) is mounted on the trailer 200, so as to be able tosupply the electric power stored in the power storage unit 50 or theelectric power generated by the fuel cell stack 40 to the stay space Svia the second electric-power supply unit. Accordingly, even in a statewhere the housing 10 (the fuel cell system 1) is mounted on the trailer200, the electric power of the fuel cell system 1 can be supplied to adevice (for example, the electronic device 150) in the stay space S viathe second electric-power supply unit, and the convenience provided bythe fuel cell system 1 can be improved.

The input/output unit 19 may be electrically connected to the secondelectric-power supply unit and at least one of the vehicle 100 and thefirst electric-power supply unit 230 in a state where the housing 10 ismounted on the trailer 200. Further, the input/output unit 19 may beconfigured to be able to supply the electric power stored in the powerstorage unit 50 or the electric power generated by the fuel cell stack40, to the second electric-power supply unit and at least one of thevehicle 100 and the first electric-power supply unit 230 connectedthereto. Accordingly, the electric power of the fuel cell system 1 canbe used at the same time by a device connected to the vehicle 100 or thefirst electric-power supply unit 230 and a device connected to thesecond electric-power supply unit, and the convenience provided by thefuel cell system 1 can be further improved.

The housing 10 may further include a storage unit (not shown) capable ofstoring generated water generated by the electric power generation ofthe fuel cell stack 40 and supplying the stored generated water to thetrailer 200. In this way, it is possible to use the water, which isgenerated at the time of electric power generation of the fuel cellstack 40, in the trailer 200. In addition, the storage unit may beconnected to a pipeline (not shown) connected to the stay space S, andmay be capable of supplying the stored generated water to the stay spaceS via the pipeline. Accordingly, water can be supplied to the stay spaceS where the person stays, and convenience for the user staying in thestay space S can be improved.

In addition, the storage part may convert water vapor generated byelectric power generation of the fuel cell stack 40 into water droplets,recover and purify the water droplets, and supply the purified water tothe trailer 200 (stay space S) as generated water. Accordingly, it ispossible to supply clean water that is convenient for the user, and itis possible to improve the convenience for the user who stays in thestay space S.

(Functional Configuration of Moving Body)

Next, an example of a functional configuration of the moving body 300will be described with reference to FIG. 11 . As illustrated in FIG. 11, the fuel cell system 1 mounted on the trailer 200 of the moving body300 includes the control unit 90 in addition to the hydrogen storageunit 30, the fuel cell stack 40, the power storage unit 50, and theinput/output unit 19 described above.

The control unit 90 is provided in the control unit 60 described above,and is implemented with, for example, an electronic control unit (ECU)that includes a processor that performs various calculations, a storagedevice that stores various types of information, an input/output devicethat controls input/output of data between an inside and an outside ofthe control unit 90, and the like. As indicated by dashed arrows in FIG.11 , the control unit 90 can control electric power generation of thefuel cell stack 40 and charging and discharging of the power storageunit 50, and can also communicate with the vehicle 100 via theconnection cable 320.

Here, the vehicle 100 is a hybrid electric vehicle, an electric vehicle,or the like, and includes a drive device 110 that is implemented with adrive motor or the like that is driven in response to supply of electricpower, and a battery 120 that can supply electric power to the drivedevice 110. The vehicle 100 can travel by driving of the drive device110. The vehicle 100 derives a remaining amount (for example, State OfCharge (SOC)) of the battery 120 from an output of the battery 120detected by a battery sensor (not shown), and transmits remaining amountinformation indicating the derived remaining amount of the battery 120to the control unit 90 via the connection cable 320.

The control unit 90 controls supply of electric power from the fuel cellsystem 1 to the vehicle 100 based on the remaining amount informationacquired from the vehicle 100. Accordingly, even when the remainingamount of the battery 120 decreases, the electric power required in thevehicle 100 can be secured by the electric power of the fuel cell system1. Therefore, the convenience of the vehicle 100 can be improved.

For example, when the control unit 90 detects that the remaining amountof the battery 120 is equal to or less than a threshold based on theremaining amount information acquired from the vehicle 100, the controlunit 90 starts supply of electric power from the fuel cell system 1 tothe battery 120. Accordingly, when the electric power of the battery 120decreases as the vehicle 100 travels, the electric power of the fuelcell system 1 can be supplied to the battery 120 to charge the battery120. Therefore, the mileage of the vehicle 100 can be increased by theelectric power of the battery 120.

When the control unit 90 detects that the remaining amount of thebattery 120 is equal to or less than the threshold based on theremaining amount information acquired from the vehicle 100, the controlunit 90 may start supply of electric power from the fuel cell system 1to the drive device 110. That is, the control unit 90 may directlysupply electric power from the fuel cell system 1 to the drive device110. Accordingly, even w % ben the remaining amount of the battery 120decreases, electric power required by the drive device 110 (for example,the electric power required for the drive device 110 to cause thevehicle 100 to travel) can be secured by the electric power of the fuelcell system 1.

When supplying electric power from the fuel cell system 1 to the vehicle100, the control unit 90 first supplies electric power of the powerstorage unit 50 to the vehicle 100. The electric power of the powerstorage unit 50 supplied to the vehicle 100 is supplied to, for example,the drive device 110 for driving. That is, the control unit 90 maysupply the electric power of the power storage unit 50 to the drivedevice 110 when starting supply of electric power to the vehicle 100.Accordingly, the electric power required by the drive device 110 can besecured by the electric power of the power storage unit 50. In addition,when there is surplus electric power in the electric power that can beoutput from the power storage unit 50 while supply of electric power tothe drive device 110 is performed, the control unit 90 may supply thesurplus electric power to the battery 120 to charge the battery 120.Accordingly, the battery 120 is charged by the electric power of thepower storage unit 50, and the mileage of the vehicle 100 can beincreased by the electric power of the battery 120. The electric powerof the power storage unit 50 is supplied to the vehicle 100 via theinput/output unit 19 and the connection cable 320.

Thereafter, when a remaining amount of the power storage unit 50 isequal to or less than a predetermined threshold, the control unit 90causes the fuel cell stack 40 to start electric power generation.Accordingly, even after the remaining amount of the power storage unit50 is low, the supply of electric power to the vehicle 100 can becontinued with the electric power generated by the fuel cell stack 40.

In addition, the control unit 90 supplies the electric power generatedby the fuel cell stack 40 in accordance with a predetermined priorityorder. Specifically, when it is necessary to supply electric powergenerated by the fuel cell stack 40 to the drive device 110 in order tomaintain driving of the vehicle 100, the control unit 90 first gives ahighest priority to supply of electric power to the drive device 110.Accordingly, the electric power required by the drive device 110 can besecured with the electric power generated by the fuel cell stack 40.

Then, only when there is surplus electric power while supply of electricpower to the drive device 110 is performed, the control unit 90 suppliesthe electric power generated by the fuel cell stack 40 to the battery120 and the power storage unit 50. At this time, the control unit 90preferentially supplies electric power to the battery 120 over the powerstorage unit 50. That is, the control unit 90 first charges the battery120, and when the remaining amount of the battery 120 reaches apredetermined value (for example, a fully charged state) and thecharging of the battery 120 is completed, the control unit 90 chargesthe power storage unit 50. Accordingly, it is possible to charge thebattery 120 at an early stage. Therefore, the mileage of the vehicle 100with the electric power of the battery 120, that is, the mileage of thevehicle 100 alone can be recovered at an early stage, and theconvenience for the user of the vehicle 100 can be improved.

In addition, after charging of the power storage unit 50 and the battery120 by the electric power generated by the fuel cell stack 40 iscompleted, that is, after the remaining amounts of the power storageunit 50 and the battery 120 reach a predetermined value, the controlunit 90 may cause the fuel cell stack 40 to continue the electric powergeneration and supply the generated electric power to the drive device110. Accordingly, the driving of the drive device 110 can be maintainedwithout consuming the electric power of the battery 120. Therefore, itis possible to cause the vehicle 100 to travel while maintaining themileage of the vehicle 100 with the electric power of the battery 120,that is, the mileage of the vehicle 100 alone, and it is possible toimprove the convenience for the user of the vehicle 100.

When the hydrogen in the hydrogen storage unit 30 runs out as a resultof continuing the electric power generation performed by the fuel cellstack 40, the control unit 90 may subsequently supply the electric powerof the power storage unit 50 to the drive device 110. Accordingly, thedriving of the vehicle 100 by the drive device 110 can be maintainedwithout consuming the electric power of the battery 120. Therefore, itis possible to cause the vehicle 100 to travel while maintaining themileage of the vehicle 100 with the electric power of the battery 120,that is, the mileage of the vehicle 100 alone, and it is possible toimprove the convenience for the user of the vehicle 100.

For example, when an ignition power supply (power supply for driving thedrive device 110, which is also referred to as an IG power supplyhereinafter) of the vehicle 100 is off, the control unit 90 stops theelectric power generation performed by the fuel cell stack 40.Accordingly, when the driving of the vehicle 100 by the drive device 110is ended, the electric power generation performed by the fuel cell stack40 is stopped, and the consumption of hydrogen can be suppressed.

When the remaining amount of the power storage unit 50 is equal to orless than the threshold after the electric power generation performed bythe fuel cell stack 40 is stopped, the control unit 90 may restart theelectric power generation performed by the fuel cell stack 40 to chargethe power storage unit 50. Accordingly, even after the electric powergeneration performed by the fuel cell stack 40 is temporarily stopped,when the electric power of the power storage unit 50 decreases, theelectric power generation of the fuel cell stack 40 is restarted, andthe power storage unit 50 can be charged.

(Control Method for Fuel Cell System)

Next, an example of a control method for the fuel cell system 1 will bedescribed with reference to FIG. 12 . This control method can beimplemented, for example, by a processor of the ECU implementing thecontrol unit 90 executing a program stored in advance in a storagedevice or the like.

At a predetermined timing including one during moving of the moving body300 (that is, during traveling of the vehicle 100), the control unit 90acquires remaining amount information indicating a remaining amount ofthe battery 120 from the vehicle 100 (step S1). Then, the control unit90 determines whether the remaining amount of the battery 120 is equalto or less than a threshold based on the acquired remaining amountinformation (step S2). When the remaining amount of the battery 120 issufficient (step S2: NO), the control unit 90 returns to step S1.

On the other hand, when the remaining amount of the battery 120 is equalto or less than the threshold (step S2: YES), the control unit 90 startssupply of electric power from the power storage unit 50 to the vehicle100 (step S3). Then, the control unit 90 determines whether a remainingamount of the power storage unit 50 is equal to or less than a threshold(step S4). When the remaining amount of the power storage unit 50 issufficient (step S4: NO), the control unit 90 continues the supply ofelectric power from the power storage unit 50 to the vehicle 100.

On the other hand, when the remaining amount of the power storage unit50 is equal to or less than the threshold (step S4: YES), the controlunit 90 causes the fuel cell stack 40 to start electric power generation(step S5). Then, the control unit 90 supplies the electric powergenerated by the fuel cell stack 40 to the drive device 110, the battery120, and the power storage unit 50 (step S6). At this time, as describedabove, the control unit 90 preferentially supplies the electric powergenerated by the fuel cell stack 40 in an order of the drive device110>the battery 120>the power storage unit 50.

Next, the control unit 90 determines whether the IG power supply of thevehicle 100 is turned off or a remaining amount of the power storageunit 50 is equal to or greater than a predetermined value (for example,the power storage unit 50 is in a fully charged state) (step S7). When anegative determination is made in step S7 (step S7: NO), the controlunit 90 returns to step S6. In this case, the electric power generationperformed by the fuel cell stack 40 is continued. On the other hand,when a positive determination is made in step S7 (step S7: YES), thecontrol unit 90 stops the electric power generation performed by thefuel cell stack 40 (step S8), and ends the series of processing.

As described above, when the remaining amount of the power storage unit50 is equal to or less than the threshold after the electric powergeneration performed by the fuel cell stack 40 is stopped, the controlunit 90 may restart the electric power generation performed by the fuelcell stack 40 and charge the power storage unit 50 with the electricpower generated by the fuel cell stack 40.

(Specific Example of Electric Power Supply by Fuel Cell System)

Next, a specific example of electric power supply by the fuel cellsystem 1 will be described with reference to FIG. 13 . In the followingdescription of FIG. 13 , the same components as those described abovewith reference to FIG. 11 are denoted by the same reference signs, and adescription thereof is omitted as appropriate.

In the example illustrated in FIG. 13 , the fuel cell system 1 ismounted on the trailer 200 towed by the vehicle 100, and is electricallyconnected to the vehicle 100. That is, the fuel cell system 1 can supplyelectric power to the vehicle 100.

(a) of FIG. 13 illustrates a remaining amount of hydrogen stored in thehydrogen storage unit 30 of the fuel cell system 1 (shown as hydrogenremaining amount). (b) of FIG. 13 illustrates a remaining amount of thebattery 120 of the vehicle 100 (shown as the battery remaining amount).(c) of FIG. 13 illustrates presence or absence (on/off) of electricpower generation performed by the fuel cell stack 40 of the fuel cellsystem 1 (shown as FC electric power generation). (d) of FIG. 13illustrates an electric-power source (shown as a load) of electric powersupplied to the drive device 110 of the vehicle 100, and specifically,“BAT” indicates the battery 120, and “FC” indicates the fuel cell stack40.

In a period from a time point t0 to a time point t1 shown in FIG. 13 ,the vehicle 100 is traveling by supplying the electric power of thebattery 120 to the drive device 110. Therefore, in this period, theremaining amount of the battery 120 gradually decreases.

At the time point t1 shown in FIG. 13 , it is assumed that the remainingamount of the battery 120 reaches a threshold Th. Here, the threshold This a threshold serving as a condition for starting supply of electricpower from the fuel cell system 1 to the vehicle 100. Althoughillustration is omitted, it is assumed that a remaining amount (notshown) of the power storage unit 50 of the fuel cell system 1 is alsoequal to or less than a threshold at the time point t1.

In this case, the control unit 90 starts electric power generationperformed by the fuel cell stack 40 from time point t1, and supplies theelectric power generated by the fuel cell stack 40 to the vehicle 100.The electric power generated by the fuel cell stack 40 and supplied tothe vehicle 100 is used for driving the drive device 110 (that is,traveling of the vehicle 100) and charging the battery 120.

Then, at a time point t2 after the time point t1, it is assumed that theremaining amount of the battery 120 is equal to or greater than apredetermined value (for example, the SOC of the battery 120 is 100%),and the charging of the battery 120 is completed. However, the controlunit 90 continues the electric power generation by the fuel cell stack40 and the supply of the generated electric power to the vehicle 100even after the time point t2 until the predetermined time point t3, forexample. Accordingly, the vehicle 100 can be caused to travel whilemaintaining the remaining amount of the battery 120 until the time pointt3. Here, the time point t3 is, for example, a time point at which theelectrical connection between the fuel cell system 1 and the vehicle 100is released. Further, the time point t3 may be a time point at which theremaining amount of hydrogen stored in the hydrogen storage unit 30becomes equal to or less than the threshold. After such a time point 13,the vehicle 100 travels by supplying the electric power of the battery120 to the driving device 110.

It is assumed that the IG power supply of the vehicle 100 is turned offat a time point t4 between the time point t2 and the time point t3. Inthis case, as indicated by a thick broken line in FIG. 13 , the controlunit 90 ends the power generation performed by the fuel cell stack 40 atthe time point t4. In this case, when the IG power supply of the vehicle100 is thereafter turned on, the electric power of the battery 120 issupplied to the driving device 110, so that the vehicle 100 travels.

Although an embodiment of the present invention has been described abovewith reference to the accompanying drawings, it is needless to say thatthe present invention is not limited to the above-described embodiment.It will be apparent to those skilled in the art that various changes andmodifications may be conceived within the scope of the claims, it isalso understood that the various changes and modifications belong to thetechnical scope of the present invention. The components in theembodiments described above may be combined freely within a range notdeparting from the spirit of the invention.

In the present specification, at least the following matters aredescribed. Although corresponding components or the like in the aboveembodiment are shown in parentheses, the present disclosure is notlimited thereto.

(1) A housing that houses a fuel cell system, the fuel cell systemincluding: a hydrogen storage unit (hydrogen storage unit 30) forstoring hydrogen; a fuel cell stack (fuel cell stack 40) that generateselectric power using hydrogen supplied from the hydrogen storage unit; apipe that connects the hydrogen storage unit and the fuel cell stack;and a power storage unit (power storage unit 50) that stores electricpower obtained by electric power generation performed by the fuel cellstack or supply from the outside, where:

-   -   an upper surface portion of the housing and at least one of side        surface portions of the housing is provided with ventilation        holes (ventilation holes 14 and 16) which are capable of        ventilating the inside and the outside of the housing; and    -   an air supply device (air supply devices 21 and 22) for        discharging air taken in through one ventilation hole of the        ventilation hole of the upper face portion and the ventilation        hole of the side face portion from the other ventilation hole.

According to (1), at least one of the upper surface portion and the sidesurface portion of the housing that houses the fuel cell system isprovided with the ventilation hole that is capable of ventilating theinside and outside of the housing, and the air supply device thatdischarges the air taken in through one ventilation hole of theventilation holes from the other ventilation hole is provided, so thatthe air permeability between the inside and the outside of the housingis improved, the hydrogen can be quickly discharged to the outside ofthe housing even when hydrogen is generated inside the housing, so thatthe hydrogen can be suppressed from flowing toward the power storageunit inside the housing. Accordingly, the safety of the fuel cell systemcan be improved.

(2) The housing according to (1), wherein

-   -   the air supply device is provided at a position facing the        ventilation hole of the upper surface portion.

According to (2), since the air supply device is provided at a positionfacing the ventilation hole of the upper surface portion, it is possibleto quickly discharge the hydrogen which has a specific gravity smallerthan that of the air and has risen in the housing from the ventilationhole of the upper surface portion to the outside of the housing.

(3) The housing according to (1) or (2), wherein

-   -   the ventilation hole of the upper surface portion and the        ventilation hole of the side surface portion are provided at        positions corresponding to a side (a side 18) connecting the        upper surface portion and the side surface portion.

According to (3), it is possible to secure the air permeability betweenthe inside and the outside of the housing while maintaining the strengthof the housing.

(4) The housing according to any one of (1) to (3), wherein

-   -   the hydrogen storage unit is provided at a position overlapping        the ventilation hole of the upper surface portion in a top view        of the housing, and is provided at a position overlapping with        the ventilation hole of the side surface portion in a side view        of the housing.

According to (4), the hydrogen released to the periphery of the hydrogenstorage unit can be quickly discharged to the outside of the housing.

(5) The housing according to any one of (1) to (4),

-   -   further including an input/output unit (input/output unit 19)        used for input/output of electric power between the fuel cell        system and the outside,    -   wherein the input/output unit is provided below the ventilation        hole of the side surface portion.

According to (5), it is possible to achieve both of securing theaccessibility to the input/output unit of the user and securing the airpermeability of the ventilation hole of the side surface portion.

(6) The housing according to (5), wherein

-   -   the housing is mounted on the towed portion of a moving body        (moving body 300) including a towing portion (vehicle 100) and a        towed portion (trailer 200) towed by the towing portion, and the        side surface portion provided with the input/output unit is        disposed so as to face the towing portion side in a state of        being mounted on the towed portion.

According to (6), the wiring distance between the towing portion and thefuel cell system can be shortened, and these electrical connections canbe easily performed.

(7) The housing according to (6), wherein

-   -   the housing is disposed at a position closer to the towing        portion than a rear end portion (a virtual line L1) of a wheel        provided in the towed portion in a state of being mounted on the        towed portion.

According to (7), the housing can be protected by the wheels of thetowed portion when the rear-end collision with the towed portion occurs,and damage to the housing can be suppressed.

(8) The housing according (6) to or (7), wherein

-   -   the housing is disposed at a position where a center of gravity        of the housing is closer to the towing portion than an axle (a        virtual line L2) of the towed portion in a state of being        mounted on the towed portion.

According to (8), the stability of the moving body during movement canbe improved.

(9) The housing according to any one of (6) to (8), wherein

-   -   the towed portion is provided with an attachment/detachment        portion (attachment/detachment portion 210) to which the housing        can be attached from the outside, and    -   the housing is mounted on the towed portion by being attached to        the attachment/detachment portion.

According to (9), it is possible to easily mount the housing (fuel cellsystem) on the towed portion.

(10) The housing according to (9), wherein

-   -   the attachment/detachment portion is provided on a side surface        portion facing the tow portion of the side surface portions of        the towed portion, and    -   the housing is attached to the attachment/detachment portion        from the towing portion side.

According to (10), it is possible to easily mount the housing (fuel cellsystem) on the towed portion.

(11) The housing according to (9) or (10), wherein

-   -   the housing is attached to the attachment/detachment portion via        a cover member (cover member 220) that covers the        attachment/detachment portion.

According to (11), the housing can be reliably attached by theattachment/detachment portion.

(12) The housing according to (11), wherein

-   -   the housing is attached to the attachment/detachment portion via        the cover member that covers the attachment/detachment portion        from the towing portion side.

According to (12), the housing can be protected from foreign matterssuch as mud splashes, flying stone, or the like from the front sidecaused by the movement of the moving body.

(13) The housing according to any one of (6) to (12), wherein

-   -   the towed portion is provided with a first electric-power supply        unit (first electric-power supply unit 230) capable of supplying        electric power to the outside of the towed portion, and    -   the input/output unit is configured to be electrically connected        to the first electric-power supply unit in a state where the        housing is mounted on the towed portion, so as to be able to        supply electric power stored in the power storage unit or        electric power generated by the fuel cell stack to the outside        via the first electric-power supply unit.

According to (13), even when the housing (fuel cell system) is mountedon the towed portion, the electric power of the fuel cell system can beeasily supplied to the outside via the first electric-power supply unit,and the convenience of the fuel cell system can be improved.

(14) The housing according to any one of (9) to (13), wherein

-   -   the towed portion is provided with a stay space (a stay space S)        in which a person can stay, and    -   the housing is disposed outside the stay space in the towed        portion.

According to (14), the livability of the stay space can be improved.

(15) The housing according to (14), wherein

-   -   the towed portion is provided with a first electric-power supply        unit capable of supplying electric power to the outside of the        towed portion, and a second electric-power supply portion        capable of supplying electric power to the inside of the stay        space, and    -   the input/output unit is configured to be electrically connected        to at least one of the towing portion and the first        electric-power supply unit and the second electric-power supply        unit in a state where the housing is mounted on the towed        portion, so as to be able to supply electric power stored in the        power storage unit or electric power generated by the fuel cell        stack to at least one of the connected towing portion and the        first electric-power supply unit and the second electric-power        supply unit.

According to (15), the electric power of the fuel cell system can beused at the same time in the device connected to the towing portion orthe first electric-power supply unit and the device connected to thesecond electric-power supply unit, and the convenience of the fuel cellsystem can be further improved.

(16) The housing according to any one of (6) to (15),

-   -   further comprising a storage unit configured to store generated        water generated by electric power generation performed by the        fuel cell stack and be able to supply the stored generated water        to the towed portion.

According to (16), it is possible to use water, which is generated atthe time of electric power generation of the fuel cell stack, in thetowed portion.

(17) The housing according to (16), wherein

-   -   the towed portion is provided with a stay space where a person        can stay, and    -   the storage unit is connected to a pipeline for using the        generated water in the stay space.

According to (17), it is possible to supply water to the stay spacewhere a person stays, and it is possible to improve the convenience ofthe user staying in the stay space.

(18) The housing according to (17), wherein

-   -   the storage unit converts water vapor generated by electric        power generation of the fuel cell stack into water droplets,        collects and purifies the water droplets, and supplies the        purified water to the towed portion as the generated water.

According to (18), it is possible to supply clean water that isconvenient for the user, and it is possible to improve the conveniencefor the user staying in the stay space.

The invention claimed is:
 1. A housing that houses a fuel cell system,the fuel cell system including: a hydrogen storage unit configured tostore hydrogen; a fuel cell stack that generates electric power usinghydrogen supplied from the hydrogen storage unit; a pipe that connectsthe hydrogen storage unit and the fuel cell stack; and a power storageunit that stores electric power obtained by electric power generationperformed by the fuel cell stack or supplied from outside the fuel cellstack, the housing comprising: an upper surface portion; a plurality ofside surface portions; an upper ventilation hole, provided with theupper surface portion, configured to ventilate an inside and an outsideof the housing; a side ventilation hole, provided with a side surfaceportion of the plurality of side surface portions, configured toventilate the inside and the outside of the housing; and an air supplydevice configured to discharge air taken in through one ventilation holeof the upper ventilation hole of the upper surface portion and the sideventilation hole of the side surface portion from another ventilationhole of the upper ventilation hole of the upper surface portion and theside ventilation hole of the side surface portion, wherein the hydrogenstorage unit is provided at a position overlapping the upper ventilationhole of the upper surface portion in a top view of the housing, and isprovided at a position overlapping with the side ventilation hole of theside surface portion in a side view of the housing.
 2. A housing thathouses a fuel cell system, the fuel cell system including: a hydrogenstorage unit configured to store hydrogen; a fuel cell stack thatgenerates electric power using hydrogen supplied from the hydrogenstorage unit; a pipe that connects the hydrogen storage unit and thefuel cell stack; and a power storage unit that stores electric powerobtained by electric power generation performed by the fuel cell stackor supplied from outside the fuel cell stack, the housing comprising: anupper surface portion; a plurality of side surface portions; an upperventilation hole, provided with the upper surface portion, configured toventilate an inside and an outside of the housing; a side ventilationhole, provided with a side surface portion of the plurality of sidesurface portions, configured to ventilate the inside and the outside ofthe housing; and an air supply device configured to discharge air takenin through one ventilation hole of the upper ventilation hole of theupper surface portion and the side ventilation hole of the side surfaceportion from another ventilation hole of the upper ventilation hole ofthe upper surface portion and the side ventilation hole of the sidesurface portion; and an input/output unit used for input/output ofelectric power between the fuel cell system and the outside, wherein:the input/output unit is provided below the side ventilation hole of theside surface portion; and the housing is mounted on a towed portion of amoving body including a towing portion and a towed portion towed by thetowing portion, and the side surface portion provided with theinput/output unit is disposed so as to face a towing portion side in astate of being mounted on the towed portion.
 3. The housing according toclaim 2, wherein the housing is disposed at a position closer to thetowing portion than a rear end portion of a wheel provided in the towedportion in a state of being mounted on the towed portion.
 4. The housingaccording to claim 2, wherein the housing is disposed at a positionwhere a center of gravity of the housing is closer to the towing portionthan an axle of the towed portion in a state of being mounted on thetowed portion.
 5. The housing according to claim 2, wherein: the towedportion is provided with an attachment/detachment portion to which thehousing can be attached from the outside; and the housing is mounted onthe towed portion by being attached to the attachment/detachmentportion.
 6. The housing according to claim 5, wherein: theattachment/detachment portion is provided on a side surface portionfacing the tow portion of the side surface portions of the towedportion; and the housing is attached to the attachment/detachmentportion from the towing portion side.
 7. The housing according to claim5, wherein the housing is attached to the attachment/detachment portionvia a cover member that covers the attachment/detachment portion.
 8. Thehousing according to claim 7, wherein the housing is attached to theattachment/detachment portion via the cover member that covers theattachment/detachment portion from the towing portion side.
 9. Thehousing according to claim 2, wherein: the towed portion is providedwith a first electric-power supply unit capable of supplying electricpower to the outside of the towed portion; and the input/output unit isconfigured to be electrically connected to the first electric-powersupply unit in a state where the housing is mounted on the towedportion, so as to be able to supply electric power stored in the powerstorage unit or electric power generated by the fuel cell stack to theoutside via the first electric-power supply unit.
 10. The housingaccording to claim 5, wherein the towed portion is provided with a stayspace where a person can stay, and the housing is disposed outside thestay space in the towed portion.
 11. The housing according to claim 10,wherein: the towed portion is provided with a first electric-powersupply unit capable of supplying electric power to the outside of thetowed portion, and a second electric-power supply unit capable ofsupplying electric power to the inside of the stay space; and theinput/output unit is configured to be electrically connected to at leastone of the towing portion and the first electric-power supply unit andthe second electric-power supply unit in a state where the housing ismounted on the towed portion, so as to be able to supply electric powerstored in the power storage unit or electric power generated by the fuelcell stack to at least one of the towing portion and the firstelectric-power supply unit and the second electric-power supply unitelectrically connected to the input/output unit.
 12. The housingaccording to claim 2, further comprising a storage unit configured tostore generated water generated by electric power generation performedby the fuel cell stack and be able to supply the stored generated waterto the towed portion.
 13. The housing according to claim 12, wherein:the towed portion is provided with a stay space where a person can stay;and the storage unit is connected to a pipeline for using the generatedwater in the stay space.
 14. The housing according to claim 13, whereinthe storage unit converts water vapor generated by electric powergeneration of the fuel cell stack into water droplets, collects andpurifies the water droplets, and supplies the purified water to thetowed portion as the generated water.
 15. A housing that houses a fuelcell system, the fuel cell system including: a hydrogen storage unitconfigured to store hydrogen; a fuel cell stack that generates electricpower using hydrogen supplied from the hydrogen storage unit; a pipethat connects the hydrogen storage unit and the fuel cell stack; and apower storage unit that stores electric power obtained by electric powergeneration performed by the fuel cell stack or supplied from outside thefuel cell stack, the housing comprising: an upper surface portion; aplurality of side surface portions; an upper ventilation hole, providedwith the upper surface portion, configured to ventilate an inside and anoutside of the housing; a side ventilation hole, provided with a sidesurface portion of the plurality of side surface portions, configured toventilate the inside and the outside of the housing; and an air supplydevice configured to discharge air taken in through one ventilation holeof the upper ventilation hole of the upper surface portion and the sideventilation hole of the side surface portion from another ventilationhole of the upper ventilation hole of the upper surface portion and theside ventilation hole of the side surface portion, wherein: in thehousing, the hydrogen storage unit, the fuel cell stack, and the pipeare provided at positions higher than an upper surface of the powerstorage unit; and the air supply device is provided at a position facingthe upper ventilation hole of the upper surface portion and higher thanthe hydrogen storage unit, the fuel cell stack, and the pipe.
 16. Thehousing according to claim 15, wherein the upper ventilation hole of theupper surface portion and the side ventilation hole of the side surfaceportion are provided at positions corresponding to a side connecting theupper surface portion and the side surface portion.